Management of Isotonic Maintenance Fluid Overinfusion in Young Children

Immediate Actions

• Stop the isotonic dextrose‑containing maintenance infusion immediately to prevent further volume accumulation. 1
• Perform an urgent clinical assessment for peripheral or periorbital edema, pulmonary edema (tachypnea, crackles), hepatomegaly, hypertension, and signs of heart failure. 2
• Obtain stat serum electrolytes (sodium, potassium, chloride), glucose, and serum osmolality. 3
• Check capillary blood glucose right away because the dextrose load can cause hyperglycemia. 3

Quantifying the Overinfusion

• Calculate the total volume given versus the intended maintenance volume using the Holliday‑Segar formula (≈ 100 mL kg⁻¹ day⁻¹ for a 10 kg child). 1
• Include all fluid sources—maintenance infusion, bolus doses, medication diluents, line flushes, and enteral intake—to determine the cumulative positive fluid balance. 2

Fluid Management Strategy

• Reduce the maintenance fluid rate to 65–80 % of the Holliday‑Segar estimate when risk factors for increased ADH secretion (acute illness, pain, stress, respiratory disease) are present. 1
• Further restrict the rate to 50–60 % of the Holliday‑Segar estimate if clinical signs of overload or underlying cardiac, renal, or hepatic dysfunction are evident. 2
• Continue using an isotonic balanced crystalloid (e.g., Plasma‑Lyte or Ringer’s Lactate with 5 % dextrose) rather than switching to a hypotonic solution. 4
• Transition to oral or enteral hydration as soon as the child tolerates it, allowing more precise fluid control. 3

Monitoring Protocol

• Re‑assess fluid balance and clinical status at least every 6–12 hours during the initial phase of correction. 1
• Record strict intake‑output accounting for all IV fluids, medication infusions, line flushes, and enteral feeds. 2
• Obtain daily weights to track changes in fluid status. 2
• Measure serum sodium every 6–12 hours to detect hypernatremia early. 3
• Check capillary blood glucose every 4–6 hours because of the dextrose load. 3
• Perform a daily comprehensive electrolyte panel (potassium, chloride, bicarbonate). 3

Electrolyte Management

• Sodium: If serum sodium is within the normal range, maintain the restricted isotonic fluid and continue monitoring. If hypernatremia (> 145 mEq/L) develops, keep the isotonic fluid at an even lower rate and add free water enterally if tolerated; do not switch abruptly to a hypotonic solution. 4
• Glucose: Preserve a 5 % dextrose concentration in the IV fluid to avoid hypoglycemia, but adjust downward (e.g., to 2.5 %) if persistent hyperglycemia is observed. 3
• Potassium: Supplement potassium (approximately 20–40 mEq L⁻¹) in the maintenance fluid based on serum potassium levels and clinical status, with regular monitoring to prevent hypokalemia. 3

Critical Pitfalls to Avoid

• Do not replace isotonic fluids with hypotonic solutions (e.g., D5 0.45 % NaCl) because this markedly raises the risk of iatrogenic hyponatremia and hyponatremic encephalopathy. 4
• Avoid abrupt cessation of all IV fluids without confirming adequate enteral intake, which could precipitate hypoglycemia. 3
• Reserve aggressive diuresis for severe, symptomatic overload with respiratory compromise; fluid restriction alone is usually sufficient. 1
• Always account for cumulative fluid from medication diluents and line flushes to prevent unnoticed ongoing overload. 2

Expected Clinical Course

• Mild to moderate fluid overload typically resolves within 24–48 hours when appropriate fluid restriction and monitoring are applied. 1
• Serum sodium generally remains stable under restricted isotonic fluid; any hypernatremia that occurs is usually mild and self‑limited. 1
• Full transition to enteral intake should be achieved as early as feasible, allowing complete discontinuation of IV fluids. 3

Guideline Recommendations for IV Fluid Selection and Administration in Hospitalized Patients

Pediatric Fluid Selection

• Use isotonic balanced crystalloid solutions (e.g., Plasma‑Lyte, Ringer’s Lactate) exclusively for hospitalized children to prevent hyponatremia; this recommendation carries Grade A evidence with strong consensus. 5
• Prefer balanced crystalloids over 0.9 % saline for pediatric patients, as this reduces hospital length of stay. 6
• Avoid lactate‑buffered solutions in children with severe liver dysfunction because of the risk of lactic acidosis. 7
• When the gastrointestinal tract is functional, initiate fluid therapy via the enteral/oral route first to lower complications and costs. 5

Pediatric Maintenance Volume and Composition

• For most hospitalized children (at risk of increased ADH secretion), restrict maintenance fluid volume to 65 %–80 % of the Holliday‑Segar calculation. 8
• In children with heart failure, renal failure, or hepatic failure, further restrict fluids to 50 %–60 % of the Holliday‑Segar calculation. 9
• Include all fluid inputs in daily totals—IV fluids, blood products, medication infusions, bolus drugs, line flushes, and enteral intake (excluding dedicated replacement fluids and massive transfusion). 8
• Add glucose (e.g., 5 % dextrose) with routine blood‑glucose monitoring to prevent hypoglycemia while avoiding excess that could cause hyperglycemia. 10
• Supplement potassium based on the child’s baseline level and clinical status, with regular electrolyte checks to avoid hypokalemia. 8
• Do not routinely supplement magnesium, calcium, phosphate, vitamins, or trace elements unless laboratory or clinical evidence of deficiency is present. 8

Pediatric Monitoring and Safety

• Reassess fluid balance and overall clinical status at least once daily. 8
• Monitor serum electrolytes, especially sodium, on a regular schedule. 8
• Check blood‑glucose concentrations at least daily. 10
• Prevent cumulative positive fluid balance and fluid overload, as these are linked to prolonged mechanical ventilation and increased length of stay. 8

Adult Fluid Selection

• Use balanced crystalloids (Plasma‑Lyte, Ringer’s Lactate, Isofundine) as first‑line agents for both resuscitation boluses and maintenance therapy in adult patients. 11
• Avoid 0.9 % saline when feasible because it can cause hyperchloremic metabolic acidosis and may impair renal function. 11
• Do not use synthetic colloids such as hydroxyethyl starch or gelatin due to established safety concerns. 11

Critical Pitfalls to Avoid

• Never administer hypotonic fluids for maintenance in hospitalized children; doing so markedly increases the risk of iatrogenic hyponatremia. 5

Practical Admission Orders (Illustrative)

• Pediatric: Initiate isotonic balanced crystalloid at 65 %–80 % of the Holliday‑Segar volume; add 5 % dextrose for glucose provision; supplement potassium (20–40 mEq/L) according to baseline levels; enforce daily weight checks, strict intake/output recording, and daily electrolyte and glucose labs. 8
• Adult: Begin resuscitation with balanced crystalloid boluses; maintain a restrictive maintenance rate (≈1–1.5 mL/kg/h) using balanced crystalloids; continuously evaluate fluid responsiveness before each bolus; monitor for fluid overload with daily weights and cumulative balance tracking. 11

Risk Factors for Pulmonary Fluid Overload with Dextrose 5 %

Patient‑related determinants of fluid tolerance

• The ability of a patient to tolerate intravenous fluids varies according to acute and chronic comorbidities, influencing the risk of pulmonary fluid overload. 12

Specific high‑risk clinical conditions

• Individuals with congestive heart failure are especially prone to pulmonary edema because even modest fluid excess directly worsens cardiac function. 12

Pediatric Maintenance Fluid Composition and Safety

Fluid Type Recommendations

Avoidance of Hypotonic Fluids

Exceptions Requiring Hypotonic Fluids

Monitoring in High‑Risk Situations